posted in Candy

Key Lime Fudge

Today I’m sharing what is a very spring-like recipe for Key Lime Fudge.  Scroll to the end of this post to watch a short how-to video showing you how to make this fudge, and then you can print out the recipe and make it at home.

key lime fudge stacked

The best part of spring is the green.  Where I live now (in Arizona) everything turns rather brown and lifeless in the summer.  The lawn goes dormant, only the dessert flowers survive, and most of the rest of the plants drop their leaves.  It’s not such a pretty sight.  Winter and spring are good for Arizona.  Rain comes now and then, and everything is much more green and vibrant.  Green is where it’s at.  Green makes me happy.  Key Lime Fudge is barely green, but it makes the cut and it’s a yummy spring green confection.

Key Lime Fudge on a green plate

Have you ever picked up a bag of key limes?  They’re awfully cute.  They’re tiny little things.  You’ve gotta squeeze the heck out of them to get every bit of their juice, but it’s all worth it.  They have a stronger scent and a thinner rind than the typical lime.  The flavor is more tart and bitter.  These limes present themselves nicely in sweet treats (like key lime pie!) since the sugar balances out that tart flavor and highlights the unique flavor of the key lime.  I love them!

Key Lime Fudge

You can most certainly use regular limes for this fudge.  They might give the fudge a slightly sweeter flavor, but all will still be good.  Don’t skimp on the lime zest in this recipe since it gives the fudge a fabulous green tint, and it adds a good amount of lime flavor to the recipe too.  So if you’re wishing for a little “spring” in your life and it hasn’t quite arrived yet, treat yourself to some Key Lime Fudge instead.

Click below to watch a short video showing you how to make Key Lime Fudge, then scroll to the bottom to print out the recipe and make it at home.

Key Lime Fudge

Prep Time: 15 minutes
Cook Time: 8 minutes
Total Time: 23 minutes
Servings: 36 pieces
Calories: 100 kcal

This Key Lime Fudge recipe is the perfect blend of sweet and sour!



  • 5 ounce can 2% evaporated milk
  • 1 2/3 cups granulated white sugar
  • 1/2 teaspoon salt
  • 12 large marshmallows
  • 2 cups white chocolate chips
  • 1/4 cup grated lime zest (about 5 limes)
  • 2 tablespoons key lime juice (5 to 7 limes, juiced)


  1. Line an 8" x 8" square pan with aluminum foil; grease the foil with butter. It's not a good recipe for a 9-inch square pan as the fudge will be too thin.
  2. Combine the milk, sugar and salt in a large heavy saucepan over medium heat. Stir and bring to a boil; boil 8 minutes, stirring constantly at a boil (if you have a candy thermometer, you can bring it to the soft-ball-stage, but I didn't use one). Remove the pan from heat. Add the marshmallows, chocolate, zest and juice, and stir until the marshmallows and chocolate are melted and the mixture is smooth. Scrape the fudge into the prepared pan. Tip the pan to make sure the fudge covers the bottom evenly. Cool completely, then cut into 1-inch squares.

Recipe Notes

*This recipe can be made with regular limes too.

Nutrition Facts
Key Lime Fudge
Amount Per Serving (1 piece)
Calories 100 Calories from Fat 27
% Daily Value*
Total Fat 3g 5%
Saturated Fat 1g 5%
Cholesterol 2mg 1%
Sodium 47mg 2%
Potassium 28mg 1%
Total Carbohydrates 17g 6%
Sugars 16g
Vitamin A 0.1%
Vitamin C 0.3%
Calcium 2.1%
Iron 0.2%
* Percent Daily Values are based on a 2000 calorie diet.

Here are a few more desserts using key limes that you might enjoy:

Easy Key Lime Fudge Recipe from #key #lime #keylime #fudge #recipe


  1. postedApr 10, 2014 5:37 AM

    Ohh Lori. I love anything Key Lime…But your right, those little suckers are soooooo little and takes so many to get a good amount of juice!

  2. postedApr 10, 2014 5:43 AM

    The perfect way to welcome spring, Lori! I love Key Lime anything as well as white chocolate chips. Your fudge looks divine! Cannot wait to make. Thanks for sharing girl. Pinning!

  3. postedApr 10, 2014 6:08 AM

    What a great idea! I love it when key lime anything is being made. Means it’s getting warmer outside.
    Cute plate, too!

  4. postedApr 10, 2014 7:37 AM

    Pinning this one and making ASAP!

  5. postedApr 10, 2014 7:56 AM

    What a great idea! Key lime fudge sounds absolutely delicious!

  6. postedApr 10, 2014 9:41 AM

    My FIL loves key lime desserts! He will go crazy for this fudge! Pinned!

  7. postedApr 10, 2014 11:20 AM

    I made key lime pie bars a few weeks ago with key limes. Never again will I be juicing 25 of those little ping pong balls. LOL. So I would love to just snag a few pieces of your fudge right off that plate! Gorgeous 🙂

  8. postedApr 10, 2014 11:54 AM

    Oh how I love key lime anything. These look amazing. Pinning.

  9. postedApr 10, 2014 12:37 PM

    Wow that looks amazing! I love Key lime and this just looks ooo so good!

  10. postedApr 10, 2014 2:14 PM

    Oh, I’m such a sucker for key lime anything! This fudge looks fantastic, Lori!

  11. postedApr 10, 2014 4:59 PM

    How fun Lori! I’m doing Key-Lime today too but much more conventional. 🙂 ……….even a little boring after seeing this. Love this wonderful, creative idea. It sounds just amazing!!

  12. postedApr 11, 2014 6:43 AM

    This sounds so amazing Lori! I love anything with lime 🙂 And perfect to make the Spring cut! Also, I totally agree, key limes are the cutest! Pinned 🙂

  13. postedApr 11, 2014 9:55 AM

    Lori, I never thought of a fruity fudge, but this looks so good! Loving those little green flecks!

  14. postedApr 11, 2014 12:02 PM

    Oh my I absolutely LOVE key lime in anything & everything… but FUDGE? I can’t wait! 🙂

  15. postedApr 11, 2014 8:13 PM
    Jennifer Essad

    I can’t wait to try this recipe – I love quality white chocolate and never thought of making fudge w/it or lime – thanks for the recipe – this will be so pretty served for Easter Sunday

  16. postedApr 12, 2014 7:47 PM

    Well now, I love lime. I love marsmallows, and I love fudge. It follows therefore that I am going to like this! It sounds yummy!

  17. postedApr 13, 2014 8:13 AM

    I love the flavor of key lime but they are SO TINY! I am impressed that you went ahead and squeezed enough to get so much juice for these! i’m sure these are the best sweet tart fudge bites.

  18. postedApr 13, 2014 11:55 AM

    That looks amazing. Just thinking about key limes makes me salivate!

  19. postedApr 13, 2014 12:32 PM

    They do sell key lime juice in the grocery stores around here. That makes these recipes so much easier, because they don’ t always stock the limes themselves.

  20. postedApr 14, 2014 8:12 AM

    I’m a key lime fanatic, and I love the flecks of green throughout this fudge. This must be so delicious!

  21. postedApr 14, 2014 10:06 PM

    In my former life (pre-summer 2013) I liked nothing key lime! Since that is no longer the case..I’m gonna talk my daughter into making me some of this yummy looking fudge! 🙂

  22. postedApr 15, 2014 12:43 PM

    I love key lime pie, and fudge. These sound like the perfect melding of both, and my gosh, they’re gorgeous. Going to have to make these! Thanks for sharing.

  23. postedApr 16, 2014 8:18 AM

    These bars look fantastic! We love anything key lime, especially my husband, so I will be adding this recipe to my list. Thanks for sharing.

  24. postedApr 17, 2014 6:57 PM
    Jamie @ Love Bakes Good Cakes

    I love key lime pie – I bet the key lime flavor would be AWESOME in fudge!!

  25. postedApr 23, 2014 9:36 AM
    Kindra R.

    Wow, this looks amazing! I bet your book is sooo awesome. Great recipe, thanks for sharing!

  26. postedMay 11, 2014 2:24 PM

    I made this wonderfully delicious Key Lime Fudge for a St. Patrick’s Day potluck at work. I followed the recipe exactly and it was wonderful! I took home an empty pan and was given high fives by all my co-workers! As always, Lori, thank you for sharing this scrumptious fudge recipe with all of us bakers!

  27. postedJul 20, 2014 3:35 AM
    Barbara Seidler

    I use Nellie and Joe’s Key West Lime Juice instead of juicing any limes.

    It is delicious!

  28. postedAug 13, 2014 2:28 AM

    What is the shelflife of the fudge? Must it be refridgerated?

    • postedAug 20, 2014 8:13 AM

      No need to refrigerate. Just keep it in a tightly covered container.

  29. postedJan 8, 2015 5:03 AM

    How long should it take for the fudge to set? I made these last night around 8pm and this morning it’s still soft. Did I not heat the condensed milk to a high enough temperature?


    • postedJan 10, 2015 9:08 AM

      Texture problems usually have something to do with temperature- perhaps wasn’t quite there yet, as you mentioned.

  30. postedMay 28, 2015 1:34 PM

    One 5-ounce can evaporated milk (2% or whole) So can I use regular milk and not canned? I feel funny about asking but unsure as you have (2% or whole).

    • postedMay 29, 2015 6:39 AM

      no- you definitely need to use evaporated milk… either the whole or the 2%.

  31. postedDec 24, 2015 8:26 AM
    Ashley Pendarvis

    Hey there! I changed the recipe just a tad… Instead of using 12 large marshmallows, I used a small container of fluff! I couldn’t find key limes so I just used limes… It’s delicious! So I guess you’d call it lime fudge? Anyways, I was very pleased with this recipe! Oh and I only boiled it for 6 minutes instead of 8.. Was scared to overlook bc my stove is a flat top and it can tend to over cook at times! When I’m able to get some key limes I will definitely try this original recipe! Thank you so much for this!!! 

  32. postedMar 16, 2016 8:21 PM

    I buy Nellie & Joe’s “famous” Key West Lime Juice. I find it right next to the concentrated lemon juice at Fry’s grocery store. It’s just as good as the fresh and it saves all that time squeezing!

  33. postedMar 26, 2016 5:54 AM

    I had an issue with my sugar mixture instantly hardening as soon as I added the chocolate chips. I put it back in low heat just so I could incorporate everything but could not get the sugar lumps out. Any ideas on what I did wrong so that I don’t have this issue when I make it again?

    • postedMar 29, 2016 1:22 PM

      I’m not sure… fudge can be tricky. Hard to pinpoint what went wrong, but it usually has to do with the temperature.

  34. postedApr 17, 2016 7:50 PM

    Question: About how many ounces is 2 cups of white chocolate?  I’m in another country and can only buy white chocolate in a bar form.  Thanks

    • postedApr 19, 2016 1:43 PM

      I’m not sure I can answer that… does the bar have a number of ounces on it? Perhaps you can make an estimate if you have that information.

  35. postedApr 19, 2016 6:31 PM

    I don’t know how to reply to your reply; so I’ll just post again.  The bar is 1 pound.  The issue is that 1 cup of chips isn’t the same as 1 cup (8 oz) of chocolate because the chips don’t fill all those little spaces.  I figured that if your bag had an amount of ounces on it, maybe you could do a better estimate than I could as to how many ounces are in 2 cups of chips. 

  36. postedApr 22, 2016 10:44 AM

    A bag of chocolate chips is usually right at 2 cups and weighs 12 ounces.

  37. postedMay 7, 2016 10:08 PM

    Love key lime pie and cake and buy key lime juice from Kermit’s (Key West, FL). Was wondering if you could substitute one seven-ounce jar of marshmallow creme in place of the 12 large marshmallows? Also, are the marshmallows the regular size or are they the large (huge) size as I refer to the marshmallows as miniature, regular and extra large? I am surprised the recipe does not call for any butter/margarine, other than the evaporated milk what prevents the mixture from burning when boiling the sugar, milk and salt for that amount of time (8 minutes at boiling)? Thanks.

    • postedMay 13, 2016 6:34 AM

      I’m not sure about the marshmallow creme sub as I have not tried that. Regular, large marshmallows- not jumbo. The recipe comes from an old Southern Living magazine… so I’m not sure about your last question. Good luck!

  38. postedSep 22, 2016 11:51 PM

    THANK YOU SO MUCH for having this Key Lime Fudge recipe!!! I’ve made this fudge for Family and Friends for around 30 years or more. I recently had a request from my hair dresser for some and I couldn’t find my recipe anywhere, So I spent hours on the internet trying to find a recipe suitable to mine. and just when I was flustered and ready to quit, Your site stood out and made me so happy! I cooked a batch up and your quite the recipe saver. The only thing I changed was the adding of more zest. I tend to add more just because of the way it turns out. THANK YOU AGAIN and believe me, I will be returning for more of the recipes and my Friends and Family will be guided your way! HAVE A WONDERFUL YEAR and KEEP UP THE GOOD WORK IN THE KITCHENS!!!

    • postedSep 26, 2016 7:37 AM

      Happy to hear!

  39. postedSep 30, 2016 4:04 PM

    I stumbled upon this by accident, via Purr designs. I wanted to tell you you have made my night, I can’t wait to whip this up for my wife. Major brownie points here. Keep up the great work. Thanks for the recipe!

  40. postedOct 8, 2016 2:50 PM

    I just tried this and my white chocolate chips burned as soon as I put them in the sugar mixture. I boiled the mixture for 8 min as suggested. Taste was ok but not the texture. Wound up with a pile of key lime junk and hurting hands from juicing those suckers.
    My hands smell good at least.
    Not sure how to keep the temperature down so it does not burn the chocolate.

    • postedOct 11, 2016 6:53 AM

      Not being there while you made it, it’s tough to pinpoint where it went wrong. Sounds like it was too hot. Making fudge can be tricky. Sorry you had trouble!

  41. postedNov 16, 2016 11:28 AM

    We bought some key lime fudge when we were in the Keys a couple of weeks ago. Oh my gosh I love that place. The fudge was very good and so I have been wanting to make some. I make Key Lime pies when we have get togethers. Usually a special request from my great niece. I also always have a bottle or two of Nellie and Joes Key Lime juice in my fridge. Thank you for the recipe. Can’t wait to try it.

  42. postedJun 26, 2017 10:41 AM

    This looks amazing!

    Question: does the recipe actually call for 1/4 CUP of zest, or is this a typo? Especially wondering since five tiny key limes would hardly produce that much. 

    • postedJun 30, 2017 7:47 PM

      yes! Zest away!

  43. postedApr 13, 2018 6:47 AM

    Thanks Lori. I’ll try it this weekend. Perfect spring snack 🙂

  44. postedApr 13, 2018 12:30 PM
    Cat Lennon

    Ripe key limes are yellow (and because the rind is so thin, almost impossible to zest)  so I assume the zest is from regular limes? 

    Also the riper they are the easier to juice so if try to buy yellow ones.  Unfortunately they package them in those green mesh bags which make it hard to tell. 

  45. postedApr 14, 2018 1:29 AM

    These fudge bars look so delicious and so easy to make! I love the idea of making key lime fudge – sounds yummy!

Leave a Reply

Your email address will not be published. Required fields are marked *